Study of hydro-chemical characteristics of Lake Nainital in response of human interventions, and impact of twentieth century climate change

2016 ◽  
Vol 75 (20) ◽  
Author(s):  
Dharmaveer Singh ◽  
Shive Prakash Rai ◽  
Bhishm Kumar ◽  
Sanjay K. Jain ◽  
Sudhir Kumar
2002 ◽  
Vol 13 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Alfred H. Siemens ◽  
José Angel Soler Graham ◽  
Richard Hebda ◽  
Maija Heimo

Much has been learned from the basin of the Candelaria River, Campeche, Mexico: the fabric of a densely settled pre-Historic landscape, including impressive ceremonial centers; the logistics of an ancient entrepôt; the process of exploitation of dyewood and chicle in historic times; as well as the doubtful results of the mid-twentieth-century colonization of an “empty” forested basin. It also yielded the first evidence of more or less intensive pre-Hispanic wetland agriculture in the Maya region and the remains of a profuse network of fluvial transportation from prehistoric times to the present. This article presents recent evidence regarding the management of the river system itself by means of barriers, or “dams,” which facilitated agriculture in the wetlands upstream and extensive canoe travel. These structures seem to be elaborations or imitations of the numerous natural barriers already in the stream. Two models help explain context and function. It has become apparent that the human interventions into the wetlands and the river system are to be seen less as great attainments of civilization than as fairly desperate expedients in the face of climate change.


2006 ◽  
Vol 19 (17) ◽  
pp. 4294-4307 ◽  
Author(s):  
Xuebin Zhang ◽  
Francis W. Zwiers ◽  
P. A. Stott

Abstract Using an optimal detection technique and climate change simulations produced with two versions of two GCMs, we have assessed the causes of twentieth-century temperature changes from global to regional scales. Our analysis is conducted in nine spatial domains: 1) the globe; 2) the Northern Hemisphere; four large regions in the Northern Hemispheric midlatitudes covering 30°–70°N including 3) Eurasia, 4) North America, 5) Northern Hemispheric land only, 6) the entire 30°–70°N belt; and three smaller regions over 7) southern Canada, 8) southern Europe, and 9) China. We find that the effect of anthropogenic forcing on climate is clearly detectable at global through regional scales. The effect of combined greenhouse gases and sulfate aerosol forcing is detectable in all nine domains in annual and seasonal mean temperatures observed during the second half of the twentieth century. The effect of greenhouse gases can also be separated from that of sulfate aerosols over this period at continental and regional scales. Uncertainty in these results is larger in the smaller spatial domains. Detection is improved when an ensemble of models is used to estimate the response to anthropogenic forcing and the underlying internal variability of the climate system. Our detection results hold after removal of North Atlantic Oscillation (NAO)-related variability in temperature observations—variability that may or may not be associated with anthropogenic forcing. They also continue to hold when our estimates of natural internal climate variability are doubled.


2019 ◽  
pp. 146-162
Author(s):  
Sharon Erickson Nepstad

This chapter notes that American Catholics were initially quite reluctant to embrace environmentalism. It asks, after decades of political engagement with labor, poverty, peace, women’s rights, and immigration, why did US Catholics largely overlook the growing environmental problems in the twentieth century? And what caused this to change in the early twenty-first century? The chapter summarizes early Catholic efforts to promote environmentalism and describes the initial responses of the Catholic Church and its members, who often prioritized human needs over environmental matters. It also describes how the Catholic Church and Catholic laypeople started placing greater emphasis on the environment toward the end of the twentieth century. The chapter then surveys the main themes of various Catholic teachings and publications—from the US Catholic Bishops Conference’s Renewing the Earth (1991) to Pope Francis’s encyclical Laudato Si (2015)—that have given impetus to more Catholic environmental action. The chapter concludes with a description of the work of two activist groups: the National Religious Partnership for the Environment, an ecumenical organization, and Catholic Climate Change.


Author(s):  
Susan M. Gaines ◽  
Geoffrey Eglinton ◽  
Jürgen Rullkötter

For many of us who studied and came of age in the last two decades of the twentieth century, there was nothing more prosaic, lacking in romance, and less worthy of our scientific curiosity than petroleum. The basic questions about its composition and origin had been answered, and it was no longer one of Nature’s secrets luring us to discovery, but rather the dull stuff of industry and business, money and technology. Some of us even imagined, naively, that we would witness the end of the age of fossil fuels: they were the bane of modern man, the source of pollution, environmental disaster, and climate change that threatened to disrupt ecosystems and civilizations around the entire globe. Finding new reserves, we reasoned, would only forestall the inevitable, or exacerbate the havoc. But when Jürgen joined Germany’s government-funded Institute of Petroleum and Organic Geochemistry in 1975, there was still a sense of mission in finding new reserves. The energy crisis of the early 1970s had created a heightened awareness of the value of fossil fuels and the need for conservation, but the accepted wisdom remained that oil was the key to the future and well-being of civilization. And the chemistry, it seems, was anything but banal—it was, in fact, leading not just to a better success rate in finding new reserves of oil, but also to a new understanding of life that no one had foreseen. Certainly for Geoff and the generations of organic chemists that came before him, the oils that occasionally seeped out of a crack in a rock, or came spouting out of the earth if one drilled a hole in the right place, were as intriguing as the life some said they came from. Liquid from a solid, organic from mineral, black or brown or dark red, it was as if blood were oozing from stone, an enigma that inspired inquiry from scientists long before it found its place among man’s most coveted commodities.


2019 ◽  
pp. 99-137
Author(s):  
Douglas Allen

Gandhi’s most important work on technology, Hind Swaraj, seems hopelessly ignorant, anti-modern, and anti-technology. This essay focuses on Gandhi’s perplexing writings on technology, maintaining that Gandhi’s critiques and alternatives are very significant today, but only if we are creatively selective in appropriating, reformulating, and reapplying what remains insightful. It presents a detailed analysis of Hind Swaraj and technology and Gandhi’s debates with Nehru, Tagore, and others. This essay then considers Gandhi’s positions on “modern civilization,” true civilization, and technology, and the future significance of Gandhi’s approach to technology. Included are contributions from Herbert Marcuse and other twentieth-century scholars and formulations of contemporary crises such as climate change and growing inequality with the concentration of wealth and power in the hands of the power elite. We consider the insights of a dynamic, contextually relevant Gandhian position on the appropriate role of technology in addressing such personal existential and global crises.


2020 ◽  
pp. 21-48
Author(s):  
Melissa Checker

This chapter establishes the book’s key theoretical premises, including capitalist cycles of crisis and resolution (Marx), double-bind theory (Bateson), the spatial fix (Harvey), and capitalism and schizophrenia (Deleuze and Guattari). Using New York City as an example, it discusses how city leaders resolved economic crises through the continual exploitation of natural and human resources. The constant remaking of urban neighborhoods fueled the city’s economic engine, especially as the city shifted to a real estate-based economy. Towards the end of the twentieth century, this real estate imperative coincided with increased public concern about the dangers of climate change. The broad appeal of sustainability provided the perfect cover for Mayor Michael Bloomberg’s neoliberal agenda to recreate New York as a luxury city. But just as Bloomberg’s emphasis on private industry intensified the gap between the city’s rich and poor it also unevenly distributed environmental benefits and burdens.


Author(s):  
Paul I. Palmer

The atmosphere is the thin, diffuse fluid that envelops the Earth’s surface. Despite its apparent fragility, the existence of this fluid is vital for human and other life on Earth. The Atmosphere: A Very Short Introduction describes the physical and chemical characteristics of different layers in the atmosphere, and shows how the atmosphere’s interactions with land, ocean, and ice affect these properties. It also looks at how movement in the atmosphere, driven by heat from the Sun, transports heat from lower latitudes to higher latitudes. Finally, it presents an overview of the types of measurements used to understand different parts of the atmosphere, and identifies future challenges in the light of climate change.


2016 ◽  
Vol 12 (3) ◽  
pp. 635-662 ◽  
Author(s):  
Laurie Caillouet ◽  
Jean-Philippe Vidal ◽  
Eric Sauquet ◽  
Benjamin Graff

Abstract. This work proposes a daily high-resolution probabilistic reconstruction of precipitation and temperature fields in France over the 1871–2012 period built on the NOAA Twentieth Century global extended atmospheric reanalysis (20CR). The objective is to fill in the spatial and temporal data gaps in surface observations in order to improve our knowledge on the local-scale climate variability from the late nineteenth century onwards. The SANDHY (Stepwise ANalogue Downscaling method for HYdrology) statistical downscaling method, initially developed for quantitative precipitation forecast, is used here to bridge the scale gap between large-scale 20CR predictors and local-scale predictands from the Safran high-resolution near-surface reanalysis, available from 1958 onwards only. SANDHY provides a daily ensemble of 125 analogue dates over the 1871–2012 period for 608 climatically homogeneous zones paving France. Large precipitation biases in intermediary seasons are shown to occur in regions with high seasonal asymmetry like the Mediterranean. Moreover, winter and summer temperatures are respectively over- and under-estimated over the whole of France. Two analogue subselection methods are therefore developed with the aim of keeping the structure of the SANDHY method unchanged while reducing those seasonal biases. The calendar selection keeps the analogues closest to the target calendar day. The stepwise selection applies two new analogy steps based on similarity of the sea surface temperature (SST) and the large-scale 2 m temperature (T). Comparisons to the Safran reanalysis over 1959–2007 and to homogenized series over the whole twentieth century show that biases in the interannual cycle of precipitation and temperature are reduced with both methods. The stepwise subselection moreover leads to a large improvement of interannual correlation and reduction of errors in seasonal temperature time series. When the calendar subselection is an easily applicable method suitable in a quantitative precipitation forecast context, the stepwise subselection method allows for potential season shifts and SST trends and is therefore better suited for climate reconstructions and climate change studies. The probabilistic downscaling of 20CR over the period 1871–2012 with the SANDHY probabilistic downscaling method combined with the stepwise subselection thus constitutes a perfect framework for assessing the recent observed meteorological events but also future events projected by climate change impact studies and putting them in a historical perspective.


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